Corrected error in HumidifierPrescribed and improved variable names and documentation.

This is for #33.
Merge branch 'master' into issue33_humidifier2

Conflicts:
	Annex60/Resources/ReferenceResults/Dymola/Annex60_Fluid_MixingVolumes_Examples_MixingVolumeMoistAir.txt
Added expansion vessel and updated documentation of ConservationEquation.

This is for #42.
Added expansion vessel reference results.

This is for #42.
Merge pull request #48 from iea-annex60/issue33_humidifier2

Issue33 humidifier2
Merge branch 'master' into issue42_expansionVessel
Merged actuators from Buildings to Annex60 library.

This is for #51.
Merge pull request #47 from iea-annex60/issue42_expansionVessel

Merge Issue42 expansion vessel - tested in Buildings library and no objections from my side
Merge pull request #52 from iea-annex60/issue51_actuators

Merged actuators from Buildings to Annex60 library. All examples work and code looks correct
Added missing packages to package.order.
Corrected malformed documentation which caused model not to load in OpenModelica.
Correct typo in cp of water #54

The specific heat capacity of water has been given as cp_const = 4148.
This is changed to cp_const = 4184.
Merge branch 'master' into issue54_cpWater
Updated reference results due to change in cp of water.
Merge pull request #55 from iea-annex60/issue54_cpWater

Issue54 cp water
Added dummy argument for Internal.solve

This is for #61 to avoid a warning in Dymola.
Merged damper update from Buildings lib.

This is for #64. It merges the files in which the documentation was updated.
Merge branch 'issue61_dymola2015' into issue65_synchBuildings
Added additional Type declaration.

These are needed for heat exchangers in Buildings library.
Improved documentation.